"Nagios calls itself an 'open source host, service and network
monitoring program.' In reality, though, it's more of a monitoring
framework, in that it allows an administrator to quickly fold the
one-liners they use to gather information right into the
configuration. Add to this the numerous plugins available, and you
can easily integrate Nagios with monitoring tools you already use,
like RRDTool or MRTG.
"First, though, you need to get your head around the way Nagios
approaches configuration in general, so we'll start there with a
relatively simple configuration. To get anything useful out of
Nagios, there are four things, at a minimum, that need to be
configured. They are hosts, hostgroups, contacts, and services. I'm
going to assume that, as administrators, you're as capable of
reading the README and INSTALL files that come with Nagios as I am,
so I'm not covering installation, and I'm also making the
assumption that, once installed, the configuration directory is
/etc/nagios. In this directory, there should be sample
configuration files to give you an idea of how things work. If not,
no worries--we'll create them..."
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